A29L040-70

The A29L040 is a 3.0 volt-only Flash memory organized as 524,288 bytes of 8 bits each. The 512 Kbytes of data are further divided into eight sectors of 64 Kbytes each for flexible sector erase capability. The 8 bits of data appear on I/O0 - I/O7 while the addresses are input on A0 to A18. The A29L040 is offered in 32-pin PLCC, TSOP (8mm x 20mm) or sTSOP (8mm x 14mm) packages. This device is designed to be programmed in-system with the standard system 3.0 volt VCC supply. Additional 12.0 volt VPP is not required for in-system write or erase operations. However,the A29L040 can also be programmed in standard EPROM programmers.

The A29L040 has a second toggle bit, I/O2, to indicate whether the addressed sector is being selected for erase,and also offers the ability to program in the Erase Suspend mode. The standard A29L040 offers access times of 70ns,allowing high-speed microprocessors to operate without wait states. To eliminate bus contention the device has separate chip enable (CE ), write enable (WE ) and output enable (OE ) controls.

The device requires only a single 3.0 volt power supply for both read and write functions. Internally generated and regulated voltages are provided for the program and erase operations.

The A29L040 is entirely software command set compatible with the JEDEC single-power-supply Flash standard.Commands are written to the command register using standard microprocessor write timings. Register contents serve as input to an internal state-machine that controls the erase and programming circuitry. Write cycles also internally latch addresses and data needed for the programming and erase operations. Reading data out of the device is similar to reading from other Flash or EPROM devices.

Device programming occurs by writing the proper program command sequence. This initiates the Embedded Program algorithm - an internal algorithm that automatically times the